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The Apache Commons FileUpload component provides a simple yet flexible means of adding support for multipart file upload functionality to servlets and web applications.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.fileupload.util;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import org.apache.commons.fileupload.FileItemHeaders;

/**
 * Default implementation of the {@link FileItemHeaders} interface.
 *
 * @since 1.2.1
 */
public class FileItemHeadersImpl implements FileItemHeaders, Serializable {

    /**
     * Serial version UID, being used, if serialized.
     */
    private static final long serialVersionUID = -4455695752627032559L;

    /**
     * Map of String keys to a List of
     * String instances.
     */
    private final Map> headerNameToValueListMap = new LinkedHashMap>();

    /**
     * {@inheritDoc}
     */
    @Override
    public String getHeader(String name) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            return null;
        }
        return headerValueList.get(0);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Iterator getHeaderNames() {
        return headerNameToValueListMap.keySet().iterator();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Iterator getHeaders(String name) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            headerValueList = Collections.emptyList();
        }
        return headerValueList.iterator();
    }

    /**
     * Method to add header values to this instance.
     *
     * @param name name of this header
     * @param value value of this header
     */
    public synchronized void addHeader(String name, String value) {
        String nameLower = name.toLowerCase(Locale.ENGLISH);
        List headerValueList = headerNameToValueListMap.get(nameLower);
        if (null == headerValueList) {
            headerValueList = new ArrayList();
            headerNameToValueListMap.put(nameLower, headerValueList);
        }
        headerValueList.add(value);
    }

}